• The Journal of the Korea Contents Association
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• v.7 no.10
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• pp.44-58
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• 2007

E-homestudy refers to e-Learning after school. This concept has been introduced by Korean Government as a substitute for expensive private tutoring. The purpose of this research is to explore the perceptions and relationships among determinants affecting the attitude and satisfaction level in e-homestudy. Such factors as subjective norms, visibility, perceived usefulness, quality of contents, facilitating conditions, interactions are introduced into the model. The survey results show that the attitude and the self-directed teaming level influence the satisfaction level in e-homestudy; the subjective norms, visibility, and perceived usefulness are the major determinant affecting the attitude; the quality of contents as well as interactions have positive impact on the perceived usefulness.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1895-1899
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• 2006

Seawater intrusion phenomenons of coastal area happen by natural or artificial factor. For example, density difference of seawater and fresh water, surface of the water change by tidal current, pumping, aggregate picking from mouth of a river, large scale reclamation in water area business etc. This research analyzed effect that groundwater TDS changed by pumping.As a result, it was expose that TDS density increases by sudden inflow of seawater when do pumping up more than $200m^3/day$. Finally, We are expected to prevent calamity by seawater intrusion in coastal area through this study and propose optimum pumping amount to use groundwater safety.

• Parasites, Hosts and Diseases
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• v.36 no.1
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• pp.23-32
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• 1998

The pathogenic potential of Acnnthamoebc strains was evaluated by experimental infection of murine AIDS (MAIDS) model. C57BL/6 mice were induced to immunocompromized state by intraperitoneal injection of LP-BM5 MuLV and revealed the typical splenomegalty and Iymphatic enlargement of axillar and inguinal regios on necropsy 4 weeks after viral infection. Although there was no significant difference in the mortality rate of MAIDS mouse according to the culture temperature, it was very different in the mortality rate from strain to strain of Accnthnmoebc. A. henIHi OC-3A strain isolated from the brain of a GAE patient showed !he highest mortality rate and A. culbertsoni A-1 strain from tissue culture was the second. KA/S3 and KA/S2 strains isolated from soil revealed very low virulence. The mice infected by intranasal inoculation of Acanthnmoebc showed relatively chronic course than intravenous inoculation. The gross findings of lungs and brains from infected mice were variable among mice. On the microscopic observations, the lungs showed much more severe inflammation and necrosis than the brains microscopically. This MAIDS model would be useful to study the opportunistic protozoan infections of AIDS patients. In the light of these results. the pathogenic potential and the virulence of Acnnthamoebo may be determined genetically.

• 한국벤처창업학회:학술대회논문집
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• 2008.11a
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• pp.117-132
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• 2008

본 연구는 본점 주소지 거주 주민에 의해 그 매출액을 현저히 영향을 받는다고 생각되는 소상공 서비스업체들 중 미용서비스업체의 점포 선택 결정요인을 관심 변수로 다루었다. 입지요인에 의해 영향을 받는 경영성과 측정 변수를 경영자의 만족도나 소비자의 충성도 측면에서만 진행하지 않고 미용서비스업체의 성과인 실제 매출액과 방문자수를 활용하여 연구하였다는 점에서 선행연구와 큰 차이가 있다. 본 연구 결과는 미용서비스업체의 점포입지요인중 가시성 접근성이 경영성과에 영향을 미치는 것으로 나타났다 또한 미용시술의자수가 매출액과는 (+)의 관계를 디자이너 1인당 매출액에는 (-)의 영향을 미치는 것으로 나타났다. 본 연구는 미용서비스업체에 대한 분석을 하여 다른 소상공서비스업체에 확산 적용하는데는 한계가 있다. 또한 입지특성에 있어서도 유의적 영향을 미치는 추가적인 입지 변수들을 발견할 필요가 있다.

• Journal of Korea Game Society
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• v.11 no.6
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• pp.115-125
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• 2011

Recently, a sharp increases of users of smartphone is not only cause an rapid growth smartphone-games market, but also secured it's position as a high value market. thus have to begets a multilateral study to the smartphone of newly-rising. however the earlier studies were researched previous smartphone, despite extended research is needed for smartphone-games. therefore the study's purpose is to draw a main factors it has a decisive effect for recommendation and sustainable-usage through recognizing the cause-and-effect relationship with purchase intention, purchase action, satisfaction, recommendation, and sustainable usage that based purchase-effect-factors of smartphone-games. for this study the questionnaire of 293 was taken. and structural equation model was adopted to analyze this study.

• Journal of the Korea Convergence Society
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• v.11 no.9
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• pp.229-242
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• 2020

The purpose of this study is to present the environmental factors of positive and negative aspects that affect the information security compliance intention, and reveals the relationship of the individual's the security compliance intention. The subjects of this study are employees of organizations that apply information security policies and technologies, and effective samples were obtained through surveys. In the process of analysis, the study model was verified through structural equation modeling. The measurement variables consisted of security policy, security system, technical support, work impediment, security non-visibility, compliance intention and organizational commitment and used for analysis. The results confirmed that security compliance factors such as policy, system, technical support, and non-compliance factors, work impediment, respectively, had an impact on organizational commitment, leading to compliance intention. The verification result of the research model suggests the direction of establishing a security compliance strategy for employees to improve the level of information security compliance of the organization.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.16 no.4
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• pp.92-106
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• 2017

The adverse weather is known as a factor that interrupts traffic flow and causes traffic accidents and traffic congestion by lowering visibility of drivers. Especially, in case of fog unlike any other weather conditions, traffic accidents lead to serious accidents and the fatality of the accidents is known to be high. This paper aims to analyze uninterrupted traffic flow characteristics under foggy conditions among adverse weathers. The traffic volumes and speeds under foggy and normal conditions were analyzed. Results indicated that fog with low visibility causes the most insignificant reduction in traffic volumes. On the other hand, the reduction in the speeds due to low visibility was evident. In addition, the relationship between flow, speed, and density in fog were analyzed. Analysis results showed that the fog with less than 200m visibility had clear impact on traffic flow.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.10a
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• pp.329-332
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• 2000

최근 벤처 기업에 대한 관심이 급증하면서 이들의 성공요인에 대한 연구들이 많아지고 있으며, 인터넷 비즈니스 산업도 많은 벤처기업을 배출한 산업 가운데 하나이다. 이 산업의 경우, 신규진입의 용이성으로 인하여 진입장벽이 거의 없는 산업으로 알려져 왔다. 그러나 실제 선점 기업들의 가시적인 성과가 나타남에 따라 본 연구는 이 산업에서의 진입장벽 존재 여부와 그 영향력에 대하여 알아보고자 한다. 보다 구체적으로 인터넷 비즈니스산업의 벤처기업이 가지는 진입장벽을 기존 문헌 연구 및 벤처기업 5개사와의 FGI(Focus Group Interview)를 통하여 연구개발 및 기술력(특허권), 브랜드력, 고객 전환비용, 창업자(인맥), 전략적 제휴의 5가지 변수로 압축하였다. 이들 5개 변수가 초기 진입자에게 실제 혜택을 주는가, 이들 5가지 진입장벽의 중요성은 동일한가, 그리고 이들 진입장벽이 서로 다른 사업 유형의 벤처 기업들 진입의사결정에. 동일한 영향을 주는가의 가설이 제시되었다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.47 no.12
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• pp.874-880
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• 2019

This paper introduces a method which can be effectively used for the path planning of UAV in a realistic map which has mountainous terrains, air defense networks and radars based on the Visibility Graph. Existing studies of Visibility Graph have been studied mainly for simple shape obstacles in 2-dimensional environment such as self-driving cars which avoid buildings. However, for UAV, Visibility Graph must be used in 3-dimensional environment for the variance of altitude. This occurs significant elapsed time increase because of the increase of the amount of the visibility of node sets. To solve this problem, this paper decrease the number of nodes which consists the complex terrain environments using convex hull based on Layered Visibility Graph. With convex hull method, this paper confirmed that the elapsed time is decreased about 99.5% compared to the case which has no decrease of the number of nodes.

• Korean Journal of Environmental Biology
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• v.39 no.1
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• pp.81-87
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• 2021

The monthly variability in marine algal flora and community structure was examined in the intertidal zones of Doripo, and the biomass of an edible alga, Ulva prolifera, at Gaip-ri of Hampyong Bay on the southwestern coast of Korea was investigated over one year from April 2008 to March 2009. A total of 22 seaweeds were identified including five green, four brown, and 13 red algae. Based on importance value, Ulva australis was dominant over the year and the subdominant species were Ulva linza and Caulacanthus ustulatus at the Doripo coast of Hampyong Bay. The vertical distribution in terms of importance values was in the order of Ulva linza - C. ustulatus - U. australis - Sargassum thunbergii from the upper to the lower intertidal zones. The biomass of U. prolifera ranged between 2.4-98.2 g dry wt. m^-2, with a maximum in June and a minimal in November. In the field, U. prolifera biomass could be positively related to seawater temperature. However, further research on the association between biomass and other environmental factors such as nutrients and light intensity is required.